Substation telephone set



Dec. 28 1926.

J. ERICKSON ET AL SUBSTATION TELEPHONE SET 3 Sheets-Sheet 1 Filed April 10. 1922 Dec. 28,1926. 1 1,612,621

.1. ERICKSON ET AL S'UBSTATION TELEPHONE SET Filed April 10 1922 3 Sheets-Sheet 2;

' figrgfgbsrgfilk-Juhn 111115135 Dec. 28 1926.

J. ERICKSON ET AL SUBSTATION TELEPHONE SET Filed April 10 1922 3 Sheets-Sheet 5 M IT- Patented Dec. 28, 1926.

STATES JOHN ERICKSON, F GH CAG-O, AND I-IEP;

ILLINOIS, ASSIGNORS, BY MESNE ASST OF CHICAGO, ILLINOIS, A CORPQRATION OF DELAV/ARE.

SUBSTATION TELEPHONE SET.

Application filed April 10,

The present invention relates in general to substation telephone sets, and more particularly to substation desk stands of the automatic type.

The general object of the invention is to provide a new and improved automatic desk set which has a number of mechanical improvements tending to increase its serviceability and cheapen its cost of manufacture.

In accordance with a particular feature of the invention, a number of improvements have been made in the design of the various parts whereby the telephone instruments may be readily taken apart and assembled.

A further feature of the invention relates to the provision of an improved pivot for a telephone switch-hook.

Still another feature of the invention provides a terminal of novel construction to which the connecting wires of the instrument may be attached.

The foregoing and other objects of the invention will be described hereinafter ref erence being had to the accompanying drawings.

It may be pointed out at this time that all the drawings are full size with the exception of Fig. 1 which has been drawn to a slightly reduced scale in order to enable the tele phone instrument to be shown in full on one sheet of drawings.

Referring now to the drawings,

Fig. 1 is a side view of an automatic desk telephone set. with the receiver removed, which embodies the several features of th invention. 1

Fig. 2 is a front view, partly in section along the line A A, Fig. 1. of the same instrument, and gives a general idea of its internal construction.

Fig. 3 is a side view of the metal strip which serves as a mounting plate for the switch-hook spring assembly.

Fig. 4 is a fragmentary view of the upper end of the tubular standard.

Fig. 5 is a view of the telephone from below withthe base removed and shows the arrangement of the connecting terminals, calling device, and various other details.

Fig. 6 is a view of the bracket which serves a mounting plate for the terminal strip. Fig. 7 is a detail showing cross section view of one of the connecting terminals.

Referring now particularly to Figs. 1. 2,

1922. Serial No. 551,351.

3, and 4, the base l is preferably a metal stamping of the form shown. The tubular standard 3 is provided at its upper end with a transverse slot '70 (shown in detail in Fig. 4) that permits the switch-hook to move up and down. while its lower end is forced out to form the shoulder 20. The tubular standard is placed in position in the base 4 and the lower end is then expanded by special machinery so that, for all purposes, the tubular standard 3 and the base may be considered to be in one piece.

It will be seen that the strip 21 is secured to a projection on the transmitter support 6,by the screws 26. 27, and 28 (shown in 3). The switch-hook 1 works on the pivot 63, the latter being secured in place between the transmitter support 6 and the strip 21 by the screws 26. 27. and 28., the pro jection on the transmitter support being slotted. as shown. to form a retaining means for the pivot. The switch-hook 1 extends through the slot in the strip 21 and directly controls the main spring 32 of the spring assembly, the well known function of the springs being to close the line circuit when the receiver is removed. The stud or boss 24- is stamped from the strip 21 and serves to limit the upward movement of the switch-hook 1 under influence of the spring 32 when the receiver is removed. The stud 25 which is also punched from the metal strip serves as a stop to limit the downward movement of the switch-hook when the receiver is replaced. thereupon. The screw 26 is not countersunk. as are he screws 27 and 28. but is somewhat longer and serves as a guide for the wires leading to the transmitter so that these wires do not interfere with the switchhook operation. The metal strip 21. which serves as mounting plate for the switch-hook spring assembly. is slotted at 31 and 23, through which the connecting conductors are passed. Through the lower end of the strip 21 is a pin 22 which maintains the strip 21 rigidly in place in the tubular standard 3.

Referring now more particularly to Figs. Z7. 6, and. 7, the bracket 38 which serves as a mounting plate for the connecting terminals has an extended portion, the whole being fastened in place by the eye rivet 5. The extended portion of the bracket 38 is curved (see Fig. 6) so that it fits closely around the lower end of the tubular standard. By this construction the bracket 38 is prevented from turning with the eye rivet 5 as a pivot. The eye rivet 5 also serves as an eyelet through which the receiver cord and the connecting cord from the bell box are brought.

The micarta strip 41-0 is fastened to the bracket 38 by means of the screws 417, 18, and 19. The screw as is extended so that when screwed into place there is a projecting portion which serves as a place to which the end of the receiver cord may be tied to take the strain oil the wires, as is the usual practice.

From the detailed view of one of the connecting terminals shown in Fig. 7, it will be seen that the terminal 52 extends around the micarta strip 10 and fits into a notch therein. There are two holes in the connecting terminal one above the other. Embedded in the micarta strip 1O is a nut 66. The terminal screw 46 is adapted to go through the hole in the connecting terminal and screw into the nut 66. In this manner the terminal screw 16, when screwed tightly into place, will hold the terminal of any one of the connecting wires attached to it tightly in place under all conditions.

The calling device 8 is of the usual construction and is fastened to an adapter plate 75 by means of the screw 72 and the studs 73 and 7 1. The adapter plate, to which the dial is fastened, lays over an opening in the upper portion of the base 4: and is held firmly in place by the screws 79 and 71. This adapter plate is used because the hole in the base is arranged so that various types of dials may be used without changing the construction of the base. The dial used in the present case requires the adapter plate to be employed in order to secure a proper fit.

The bottom 7, (see Fig. 2) is fastened in place by the screw 41 which goes into the end of the metal strip 21, the latter being bent at right angles and threaded to receive it. It will be noted that the screw 11 is only threaded for a short distance and also that there is a washer 78 between the base and the threaded portion. This construction enables the bottom to be removed and the screw 11 will remain associated with it, the threaded portion of the screw preventing it from slipping through the washer.

To assemble the set, the metal strip 21 to which is fastened the transmitter support 6, is slipped into the tubular standard 3 until the shoulder 30 engages the top portion of he standard, the switch-hook 1 coming in the slot- 70. The screw 19 is then tightened until it engages with the edges of the slot of the tubular standard (see Fig. 1). It will be noted that the screw 19 is tapered so that when the same is tightened the metal strip 21 carrying the switch-hook 1 is automatically centered in position. This construction enables the set to be readily assembled. without a great deal of time being spent in obtaining a proper adjustment between the switch-hook 1 and the slot 7 0 so that the switchh00k 1 does not bind on the sides of the slot. In this manner the metal strip 21 and the transmitter support 6 are held in position. The bottom 7 is then placed over the base and the screw -11 tightened. he entire assembly is thus held in place by the two screws 19 and 41, the pin 22 holding the strip 21 in a rigid vertical position. The screw 19 in addition to its function of automatically centering the metal strip 21 and the receiver hook in position, enables the bottom 8 to be removed to expose the terminal strip Without the metal strip 21 becoming loose in the tubular standard. Thus, when the phone is being repaired, the bottom 7 may be removed and the phone turned up side down without the strip 21 and transmitter support 6 becoming loose.

The features of the invention having been described, what is considered to be new and desired to have protected by Letters Patent will be pointed out in the appended claims.

What is claimed is:

1. Tn a telephone desk stand, the combination, with a tubular standard having a slot at the upper end thereof, of a member having a cylindrical portion adapted to fit inside the slotted end of said standard, a switch-hook pivoted on said member and passing through the slot in the standard, and a taper headed screw for securing the said standard and member together, the tapered head of said screw being adapted to engage the sides of the .slot in the standard when the screw is tightened in order to automatically center the said member and prevent the said switch-hook from engaging the sides of the slot.

2. In a telephone desk stand, the combination, with a tubular standard having a slot at the upper end thereof, of a member having a cylindrical portion adapted to fit inside the slotted end of said standard, a switch-hook pivoted on said member and passing through the slot in the standard, and a screw for securing said standard and member together, said screw having a tapered head adapted to engage the sides of the slot in the standard and operative to automatically center the switch-hook in said slot when the screw is tightened.

Tn a telephone desk stand, the com bination, with a tubular standard, of a plate extending through said standard and having springs mounted thereon, a transmitter support having an extended portion adapted to be joined to said plate the two being rigidly fastened together by means of screws,

a switch-hook, and a pivot for said switchhook rigidly clamped between said support and said plate, said switch-hook being adapted to rotate about said pivot to directly operate said springs.

4- In a telephone desk stand, the combination, with a tubular standard, of a plate extending through said standard and having springs mounted thereon, aswitch-hook adapted to operate said springs, a transmitter support having an extended portion adapted to be joined to said plate, the two being rigidly fastened together by means of screws, and an elongated head for one of said screws serving as a guide to maintain wires which may extend between said springs and said transmitter away from said switch-hook.

5. In a telephone desk stand, a transmitter support, a slotted tubular standard, a hook pivoted to said support and extending through the slot in said standard, and means including the slotfor securing the standard and support together, said means also eftective to automatically center the hook in said slot.

6. In a telephone desk stand, the combination, with a slotted tubular standard and a transmitter support fitting inside the slotted portion of said standard, of a switch-hook passing through the slot in said standard and pivoted on said support, and a taper headed screw also cooperating with the slotted portion of the standard for securing the standard and support together and for automatically centering the hook in said slot.

7. In a telephone desk stand, a tubular standard, a plate extending through said standard and having springs mounted thereon, a switchhook adapted to operate said springs passing through a perforation in said plate, and means on said plate for limiting the movement of said switehhook in both directions.

8. In a telephone desk stand, a transmitter head having an extension, a plate secured to said extension and carrying switchhook springs, a switchhook pivoted to said extension passing through a perforation in said plate, and projections on said plate limiting the movement of the switchhook.

9. In a telephone desk stand, a slotted tubular standard, a transmitter support, a hook pivoted to said support and extending through the slot in the standard, and means cooperating with the switchhook to maintain it pivoted to said support also effective independent of the transmitter support and standard in limiting the movement of the switchhook.

In witness whereof, I hereunto subscribe my name this 5th day of April, A. D., 1922.

JOHN ERICKSON.

In witness whereof, I hereunto subscribe my name this 5th day of April, A. 1)., 1922.

HERBERT F. OBERGFELL. 

